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CALOR ESPECÍFICO DE MATERIAIS
OBJETIVOS
Fazer com que o aluno se familiarize com as grandezas presentes na calorimetria e determinar o calor específico de alguns
materiais, manuseando um calorímetro.
Observação: esse procedimento requer um pouco mais de cuidado, pois as perdas de calor para o meio acontecem
rapidamente. O professor terá que prevenir o aluno de que o resultado pode ser prejudicado se a atividade não for feita com
certa destreza.
MATERIAIS E REAGENTES
• 2 termômetros
• 1calorímetro
• 1fogareiro
• 1 béquer
• 1tela de amianto
• 1balança digital
• 1 amostra de material para determinação do calor específico
PROCEDIMENTO
1) Medir a massa referente à amostra do material a ser pesquisado pelo grupo com o auxílio da balança digital.
Anote a massa na tabela 1.
2) Coloque o material no béquer contendo água fervente utilizando o grampo de madeira.
3) Abra o calorímetro e coloque o copo de alumínio sobre a balança zerando-a.
4) Adicione aproximadamente 30g de água à temperatura ambiente contida na garrafa térmica. Marque a massa
medida na tabela 1.
5) Coloque o copo de alumínio no calorímetro e tampe-o. Aguarde cerca de 1 minuto.
6) Faça a leitura do termômetro do calorímetro (água e calorímetro) e anote o valor na tabela 1.
7) Faça a leitura do termômetro do béquer (material) e anote o valor na tabela 1.
8) Retire o material do béquer e coloque-o dentro do calorímetro utilizando, para isto, o grampo de madeira e
abrindo apenas a tampa azul do calorímetro.
9) Feche a tampa azul do calorímetro e agite a água fazendo movimentos circulares com o calorímetro apoiado sobre
a mesa.
10)Acompanhe a variação da temperatura através da leitura do termômetro até que se estabeleça o equilíbrio térmico
(fique muito atento nesse momento pois a temperatura logo começa a diminuir). Marque o valor deste na tabela 1.
11) Limpe o local e deixe-o organizado como o encontrou no início do seu experimento.
12)Junte-se com seu grupo no canto da sala para iniciar o desenvolvimento do relatório.
TABELA DE DADOS (tabela 1)
massa
(g)
calor específico
(cal/gºC)
capacidade térmica
(cal/ºC)
temperatura inicial
(ºC)
temperatura final
(ºC)
material
(_____________)
cmaterial
água 1,0
calorímetro 9,2

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Av3 2º ano 4º bim trocas de calo rr relatório experimento

  • 1. CALOR ESPECÍFICO DE MATERIAIS OBJETIVOS Fazer com que o aluno se familiarize com as grandezas presentes na calorimetria e determinar o calor específico de alguns materiais, manuseando um calorímetro. Observação: esse procedimento requer um pouco mais de cuidado, pois as perdas de calor para o meio acontecem rapidamente. O professor terá que prevenir o aluno de que o resultado pode ser prejudicado se a atividade não for feita com certa destreza. MATERIAIS E REAGENTES • 2 termômetros • 1calorímetro • 1fogareiro • 1 béquer • 1tela de amianto • 1balança digital • 1 amostra de material para determinação do calor específico PROCEDIMENTO 1) Medir a massa referente à amostra do material a ser pesquisado pelo grupo com o auxílio da balança digital. Anote a massa na tabela 1. 2) Coloque o material no béquer contendo água fervente utilizando o grampo de madeira. 3) Abra o calorímetro e coloque o copo de alumínio sobre a balança zerando-a. 4) Adicione aproximadamente 30g de água à temperatura ambiente contida na garrafa térmica. Marque a massa medida na tabela 1. 5) Coloque o copo de alumínio no calorímetro e tampe-o. Aguarde cerca de 1 minuto. 6) Faça a leitura do termômetro do calorímetro (água e calorímetro) e anote o valor na tabela 1. 7) Faça a leitura do termômetro do béquer (material) e anote o valor na tabela 1. 8) Retire o material do béquer e coloque-o dentro do calorímetro utilizando, para isto, o grampo de madeira e abrindo apenas a tampa azul do calorímetro. 9) Feche a tampa azul do calorímetro e agite a água fazendo movimentos circulares com o calorímetro apoiado sobre a mesa. 10)Acompanhe a variação da temperatura através da leitura do termômetro até que se estabeleça o equilíbrio térmico (fique muito atento nesse momento pois a temperatura logo começa a diminuir). Marque o valor deste na tabela 1. 11) Limpe o local e deixe-o organizado como o encontrou no início do seu experimento. 12)Junte-se com seu grupo no canto da sala para iniciar o desenvolvimento do relatório. TABELA DE DADOS (tabela 1) massa (g) calor específico (cal/gºC) capacidade térmica (cal/ºC) temperatura inicial (ºC) temperatura final (ºC) material (_____________) cmaterial água 1,0 calorímetro 9,2